Institute of Maternal-Fetal Biology, University of Kansas Medical Center, Kansas City, Kansas, 66160, USA Department of Physiology, University of Manitoba, R3E 3J7, Winnipeg, Manitoba, Canada Department of Molecular and Cellular Physiology, University of Cincinnati, Cincinnati, Ohio, 45267, USA Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, Evanston, Illinois, 60208, USA Mouse Genome Informatics Resource and Mouse Genomic Nomenclature Committee, The Jackson Laboratory, Bar Harbor, Maine, 04609, USA Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, Iowa, 50011, USA Department of Cellular Biochemistry, Veterinary Medical Sciences/Animal Resource Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku Tokyo, Japan Rat Genome Database, Medical College of Wisconsin, Milwaukee, Wisconsin, 53226, USA Biochemistry Department, School of Life Sciences, University of Sussex, Brighton, BN1 9QG, UK